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I suggest Richard Tregaskis' "Guadalcanal Diary" (the book not the film). He makes it clear that the Marines learned pretty quick to kill the Japs twice after a few incidents wherein 'dead' Japs got up and killed incautious Marines. The Marines would walk the dead zone and put another bullet into every Jap body.
Great stuff. There's no substitute for hearing what the guys were thinking, and it's nice to see in its undistilled form. Historians sometimes do some selective editing.